Your immune system is often able to fend off pathogens it’s never seen before. But defending your body against all of them all at once is a tough challenge.
Fish swim in a reef at Pearl and Hermes Atoll in the Northwestern Hawaiian Islands.
AP Photo/Jacob Asher
There are a lot of myths about crystals − for example, that they are magical rocks with healing powers. An earth scientist explains some of their amazing true science.
If traveling into the past is possible, one way to do it might be sending people through tunnels in space.
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Adi Foord, University of Maryland, Baltimore County
Scientists are trying to figure out if time travel is even theoretically possible. If it is, it looks like it would take a whole lot more knowledge and resources than humans have now to do it.
Use a tissue and wash your hands after a booger explosion.
Joshua Wachs/Flickr
Measuring the ages of planets and stars is tricky. An observational astrophysicist describes the subtle clues that provide good estimates for how old different space objects are.
Without a point of reference, it can be hard to tell just how fast an airplane is traveling.
Daniel Berehulak/Getty Images News via Getty Images
A pediatric urologist explains how the bladder and the brain communicate to wake you up when you need to ‘go’ – and how that communication might break down.
Some animals, including goats, regularly give birth to two babies at once.
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